When you die in Tibia you become a Dead Human corpse depending on your gender, there's female and male.
This corpse first appears to me to have Citizen outfit and it's possible that it the backpack addon if you look closely at the corpse you can see on the back what appears to be the backpack? (visible on the male corpse, female corpse it's hard to tell in my opinion). Then around every 30 minutes, it deteriorates until around 1 hr and 30 minutes the corpse will fully disappear. Source (about time a corpse changes)
fresh female corpse:
male corpse in all stages:
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